Apex domains cannot have CNAME records.
Question and response
Question
dig xolentra.org. NS
Answer
xolentra.org. 5 NS ns-630.awsdns-14.net.
xolentra.org. 5 NS ns-1533.awsdns-63.org.
xolentra.org. 5 NS ns-62.awsdns-07.com.
xolentra.org. 5 NS ns-887.awsdns-46.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0